Pneumatic vibrating capsule



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Faiented, May 21, 1929'.

LAMBERTO 'ymnsoiir ARTURO fn'iimriiialv, or Boivin, ITALY.'

rimaniamo mamme .CAPs-Um?.

.application-siga epm as, i927, sernam.' 187,321, and is .Germany api-i14, i927.

The present invention has 'for itsobject a device consisting of a Casinin which vibrations are transmitted by air, particularly applicable tothe photographic recording of sounds and characterized'by the fact thatthe vibrations of a metallic diaphragm which is subjected to theinfluence of an electromagnet the coils of which are traversed by thecurrent-s either amplified or not,

to coming from afm-ierophone, are transmitted to a second diaphragmwhich is non-metallic, and forms a mirror for reflecting every pencilotv light rays which strikes upon it, this transmission being effectedby means of l l5 a layer of: air interposed between the two vibratingdiaphragms.

The acconipanying drawing shotvs diagrainmatieally, and in sectionthrough the axis, the casino' which is the object of the invention; itillustrates si-multaneousljr what manner a pencil l,of light is thrownupon the vibratincr mirror for-the purpose of its reflection -or thephotographie recording of the-vibrations of the said mirror.

' 25 As will be seen from the drawing, the

casing which is the object of `the invention,

comprises a box 1in which the electromagnet 2 is housed, the'coils 3 ofWhich'are traversed by a current coming from a microphone whichreceivesthe sounds, which current may be amplified by any suitablemeans; the polar .horns 4 and 5 of ltheelectromagnet 2 are located closeto the metallic diaphragm 6 and their posi-tion with relation to thisdiaphragm can be regulated.

The diaphragm 6 closes the open portion of the box 1; it. rests i'iponthe shoulders 7 of this box with the intervention of a ringA 8 of, forexample, rubber; a lid 10. 'crewed 4o upon the box l, forms an zii-rChamb ir.

Thelid 10 is provided at its centre with an .orifice 11 and is. incommunication -by means of a tubular portion 12, with the' small case 13intended lto receive the second diaphragm. The `whole devicefornied bythe lidlO, the tubular portion 12 'and the case 13 is rigid and the lid10 is pierced by sev.- eral capillaryliol'es 14 the function of whichvwill be explained hereafter. 5o The case 13 contains the Vdiaphragminii" roi- 15; this diaphragm is made 'of a plate of glass or mica ofseveral hundredths of a millimet're of thickness and is quicksilvered-K/or silvered,so that its external Asurface, -fornis a mirror; it issecured in the case 13 in the reieclte optical system 22 which impartsto .the pencil 9o Alieight -of the phi)togra'ni; it--will be 'readily ofthe dimensions of the section of the pencil same way as in the diaphragm6, that is to say, its edges are resiliently held between two.thicknesses 16 and 17 made ofany suitableV material, for examplerubber, -and'held in position by the ring 18 screwed upon the 60 case13.

The cavity comprised between the diaphragm 6 and thelid 10, the tubelil-and the cavity comprised between the-bottom of the case 13 and thediaphragm 15 form an air 55 chamber, havingr no communication with theatmosphere except through the capillary holes 14.

The vibrations of the diaphragm 6, v'hich result from the variations ofthe current cir-A 7.0 culating in thercoilfs of the electromagnet 2cause successive depressions Aand eonipres sions of varying vamplitudesin the air contained in the chamber described above; these oscillations,the inertia of which is damped by the air' evacuated o r drawnin'throughV theholes 114-, are pneumatically transmitted to thediaphragm mirror 15 vwhich refiects them whilstelimina-ting thepaiasiti'ca vis-fie brations arising from-.the inertia of the diaphragin(i.-

A. pencil' of light,'.emanating -rom any suitable source and vdirectedby the lens 19, passes through a condenser 20 the position of which isregulated iii such a 'manner that 85. the apex ,-21 of the cone oflightvwhich it projects isloeated precisely at the .centre of thed-iapihragm mirrorl; .this cone of light,

' bythe mirror, passes through an' suitable 4dimens'ions 'so that,-vv'hether it falls directly onthe 'recording film 23, or Whether itonly reaches the -latterat-er refieetion from -a prism 24 or from .amirror, its sec- `tion in the Apla-ne of the film corresponds vto 9a vthe height of a' hotogram,"this. being in order that, whentiie-recording 'of the sounds is effected' upon the fixed lm by means:of a 'ray of li'ght'tr'aversing--a movable slot, such record-ing may beeli'ected 'over the total understood that `the positions of the opticalsystem` 22 and, eventual-ly, of Vthe prism 24, are regulable, so astoallow this adjustment of light in the plane .of 'the recording vlm.

23; i The vibrations of the diaphragm -nri-rror,

modifying at each instant the luminous inf tensfty per 'unit Vof.surtaxe in the pencil 'of 110 ight are recordedvphobographicaily uponthe It will be readily understood that 'the necessity of imparting tothe pencil of light rays in the plane of the film, a-section the.diameter of which' is at least .e ual to the height of, a photosentialvex'cept in trhease of recording upon a cinematographic filmwhich moves intermittently, and that, if the photographic recording ofthe sounds is effected upon n strip which 1s given continuous motion,this condition is not necessary. v

The pneumatic vibration Casin which is' the object of the invention, maye applied not only for the photographic recording of sounds on strips orfilms but it may also be employed lin all industries, laboratories, etc.for recordin an vibratory motions, Whatever the origin o the latter maybe.

According to its particular conditions of employment, the casing whichis the object of the invention, may undergo modifications,

both in the relative positions ofthe members which it comprises ,and inthe dimen- Gram, does not ecome es sions-and nature of the latterwithout how-` Y' g -eveig-.aectin'g :the spirit 'of the invention.

We .claim i A device for use in the photogmphic recording of vibrntionsof all kinds',A com-ris'- `ing a easing, an `elec'troznagnet iocate. in

said casing, a resiiientlygmounted primary da hragm -i-nfiuen-cedby said-eiect-romagnet an extending across the: mouth of 'said casing, a covercan to said casing, said cover cap being pierced witli capil'lmyair-holes and having o tubular portion connecting two 'flanged portionsof larger diameter, one of said finnged portions extending across theprim-ery diaphragm, a secondary diaphragm having a reiecting surface andsupported resi-liently within the other Hanged portion ofsaridcover'caud a transparent 'closing' cap for said other Iiiing'edportion of the cover cap, substantially :is described.

In testimony whereof we have-signedour names to this specification.

LAMBERTO PINESCHIQ Ani-'Uno communi'.

